Introduction To Chemical Engineering Rr

Set No. 1

Code No: RR10803

I B.Tech Supplimentary Examinations, Aug/Sep 2007 INTRODUCTION TO CHEMICAL ENGINEERING (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Write the physical significance of any four dimensional groups. [4×2=8] i. Sherwood number ii. Schmidt number iii. Prandtl number iv. Match number v. Froude number vi. Euler number (b) Explain the Geometric, kinematic and dynamic similarities useful for a process. [8] 2. (a) Write about velocity gradient and rate of shear for steady flow. (b) Write about mechanism of fluid flow.

[6+10]

3. Write about enlargement and contraction losses in closed pipe lines?

[16]

4. Explain the boiling point elevation and Duhring’s rule?

[16]

5. (a) Prove that for a binary gas mixture, the diffusivity of A in B equals the diffusivity of B in A. (b) Why is it suggested that sulphur trioxide be absorbed in concentrated sulphuric acid rather than in water. [8+8] 6. (a) Write about selection of dispersed phase in liquid liquid extraction. (b) Describe rotating disc contactor and centrifugal extractor.

[4+12]

7. (a) What are the two main categories into which industrial liquid-liquid contactors are classified? Discuss about each category. (b) Describe the construction and working of a rotating disc contactor. Where is it used and what are its advantages? [6+10] 8. (a) Define the following terms pertaining to drying: i. Free moisture content ii. Wet basis iii. Dry basis iv. Moisture gradient (b) Discuss in detail about the drum dryer with a neat diagram. ⋆⋆⋆⋆⋆ 1 of 1

[8+8]

Set No. 2

Code No: RR10803

I B.Tech Supplimentary Examinations, Aug/Sep 2007 INTRODUCTION TO CHEMICAL ENGINEERING (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain briefly the material, momentum and energy balances used in an operation. (b) What an ideal gas is? Write on perfect gas mixture.

[8+8]

2. For a fluid transfer system write the total energy balance for steady flow and explain each term in the resulting expression. [16] 3. Explain in detail suction lift and cavitations?

[16]

4. Explain temperature gradient in forced convection through a metal wall?

[16]

5. (a) Prove that for a binary gas mixture, the diffusivity of A in B equals the diffusivity of B in A. (b) Why is it suggested that sulphur trioxide be absorbed in concentrated sulphuric acid rather than in water. [8+8] 6. (a) Write briefly about the selection of equipment for gas-liquid operations. (b) Write briefly about the selection of solvent in liquid-liquid extraction. [10+6] 7. (a) Describe the construction and working of a rotating disc contactor. Where is it used and what are its advantages? (b) Explain how interdispersion of liquids and separation of phases is achieved in a centrifugal extractor? Mention the uses and advantages of a centrifugal extractor. [10+6] 8. (a) Define the following terms pertaining to drying: i. ii. iii. iv.

Bound moisture Unbound moisture Critical moisture content Equilibrium moisture content

(b) Discuss in detail about the spray dryer with a neat diagram. ⋆⋆⋆⋆⋆

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[8+8]

Set No. 3

Code No: RR10803

I B.Tech Supplimentary Examinations, Aug/Sep 2007 INTRODUCTION TO CHEMICAL ENGINEERING (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain briefly the material, momentum and energy balances used in an operation. (b) What an ideal gas is? Write on perfect gas mixture.

[8+8]

2. (a) Derive an expression for the thickness of the boundary layer ‘δ ’ for the flow of a fluid part a flat plate at zero incidence. (b) For a gas obeying the equations of state, calculate the isothermal compressibility and the coefficient of thermal expansion. [8+8] 3. Explain in detail suction lift and cavitations?

[16]

4. Write about the different methods of feeding with figures?

[16]

5. (a) Define extractive distillation. (b) Briefly explain about fractional distillation. (c) Briefly explain the Mecabe-Thiele method for calculating the number of theoretical stages in distillation column. [2+6+8] 6. (a) Write short notes on: i. Cross current extraction. ii. Counter current extraction. iii. Fractional extraction. (b) Define the terms “ Extract” and “Raffinate”.

[12+4]

7. (a) Write in detail about centrifugal extractors. What are its uses and advantages? (b) Write about the construction and operation of mixer-settlers with neat diagrams. Mention their uses and advantages. [6+10] 8. (a) Define drying. How is it different from evaporation, dehydration, freeze- drying and gas drying? (b) Explain how heat and mass transfer occur simultaneously during drying. Mention the uses of drying operation. [10+6] ⋆⋆⋆⋆⋆

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Set No. 4

Code No: RR10803

I B.Tech Supplimentary Examinations, Aug/Sep 2007 INTRODUCTION TO CHEMICAL ENGINEERING (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Write on the various types of heat-exchange equipments in process-industries. [16] 2. (a) Write about velocity gradient and rate of shear for steady flow. (b) Write about mechanism of fluid flow. 3. Write about transition length for laminar and turbulent flow in a tube?

[6+10] [16]

4. Draw a neat diagram of single-pass tubular condenser and explain its working? [16] 5. (a) Describe the interphase mass transfer. (b) Describe the salient features of design of parked absorption column.

[6+10]

6. (a) Write about triangular diagram. (b) Describe the spray column as industrial liquid liquid contactor.

[8+8]

7. (a) What do you understand by the term distribution coefficient with respect to liquid-liquid extraction? Explain with reference to dilute solutions and concentrated solutions. (b) The selection of the phase to be dispersed depends on various considerations. What are they? (c) Describe the single stage equilibrium extraction with an example.

[6+4+6]

8. (a) Define drying. How is it different from evaporation, dehydration, freeze- drying and gas drying? (b) Explain how heat and mass transfer occur simultaneously during drying. Mention the uses of drying operation. [10+6] ⋆⋆⋆⋆⋆

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